package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {

    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    // 添加购物车
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //判断当前要加入到购物车的商品是否已经存在
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        //已存在
        if (list != null && list.size() > 0){
            //如果已经存在，则做数量+1处理
            //查询出来的数据只有一个，List中只有一条数据，所以直接获取，因为有口味的菜品必须选择口味，
            //所以不会出现有口味的菜品，口味为空的情况，即口味必须有值。
            ShoppingCart cart = list.get(0);
            cart.setNumber(cart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(cart);
        }else {
            //如果不存在，则添加到购物车，数量默认为1
            //判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //本次添加到购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());

            }else {
                //本次添加到购物车的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    //查看购物车
    @Override
    public List<ShoppingCart> showShoppingCart() {
        Long  userId = BaseContext.getCurrentId();
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(userId)
                .build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    //清空购物车
    @Override
    public void cleanShoppingCart() {
        Long  userId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteByUserId(userId);

    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //如果购物车中该商品数量大于1，数量减1
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(BaseContext.getCurrentId());
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if (list != null && list.size() > 0){
            shoppingCart = list.get(0);
            Integer number = shoppingCart.getNumber();
            if (number > 1){
                shoppingCart.setNumber(number - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }else {
                //如果购物车中该商品数量为1，则从购物车中删除该商品
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }
        }
    }

}
